WO2020240916A1 - Antenne multibande - Google Patents

Antenne multibande Download PDF

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Publication number
WO2020240916A1
WO2020240916A1 PCT/JP2020/002036 JP2020002036W WO2020240916A1 WO 2020240916 A1 WO2020240916 A1 WO 2020240916A1 JP 2020002036 W JP2020002036 W JP 2020002036W WO 2020240916 A1 WO2020240916 A1 WO 2020240916A1
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WO
WIPO (PCT)
Prior art keywords
antenna
inductance
frequency
band
high inductance
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Application number
PCT/JP2020/002036
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English (en)
Japanese (ja)
Inventor
渡 野口
Original Assignee
パナソニックＩｐマネジメント株式会社
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Publication of WO2020240916A1 publication Critical patent/WO2020240916A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole

Definitions

  • This disclosure relates to a multi-band antenna.
  • wireless terminals based on standards such as wireless LAN (Local Area Network) and Bluetooth (registered trademark) have begun to be installed in home appliances such as televisions and audio equipment. ..
  • wireless communication may be performed in a plurality of frequency bands corresponding to a plurality of standards.
  • a multi-band antenna capable of transmitting and receiving signals in a plurality of frequency bands with one antenna has been proposed (for example, Patent Document 1 and the like). ).
  • the dual band antenna described in Patent Document 1 includes a linear body portion and a helical coil-shaped portion.
  • This helical coil-like portion functions as a choke coil for signals in a high frequency band, and functions as a part of a miniaturized antenna for signals in a low frequency band.
  • Patent Document 1 attempts to realize a dual-band antenna that is compact and can have different effective electrical lengths depending on the frequency.
  • the present disclosure provides a multi-band antenna that resonates in a plurality of frequency bands and can realize directivity perpendicular to the resonance direction in each frequency band.
  • the multi-band antenna includes a substrate, an input terminal arranged on the substrate and input with a signal, and an antenna portion arranged on the substrate and connected to the input terminal.
  • the first low inductance portion connected in series, the first high inductance portion having a meander shape, and the conductive antenna portion having the first tip portion, which are connected in series from the input terminal side, are arranged on the substrate.
  • the first low inductance section has a lower inductance than the first high inductance section
  • the second low inductance section has a lower inductance than the second high inductance section
  • the first low inductance section has a conductive grounding section.
  • the electric length of the low inductance portion is 1/4 wavelength of the first frequency, and the sum of the electrical lengths of the first low inductance portion, the first high inductance portion, and the first tip portion is from the first frequency. It is a quarter wavelength of the lower second frequency.
  • the multi-band antenna it is possible to resonate in a plurality of frequency bands and realize directivity perpendicular to the resonance direction in each frequency band.
  • FIG. 1 is a plan view showing the configuration of the multi-band antenna according to the first embodiment.
  • FIG. 2 is a plan view showing the configuration of the multi-band antenna according to the comparative example.
  • FIG. 3 is a diagram showing an outline of directivity at the first frequency of the multi-band antenna according to the first embodiment.
  • FIG. 4 is a diagram showing an outline of the directivity of the multi-band antenna according to the comparative example at the first frequency.
  • FIG. 5 is a graph showing an example of a simulation result of the directivity of the multi-band antenna according to the first embodiment.
  • FIG. 6 is a graph showing another example of the directivity simulation result of the multi-band antenna according to the first embodiment.
  • FIG. 7 is a graph showing the relationship between the width of the ground contact portion and the minimum inductance value of each high inductance element of the second high inductance portion according to the first embodiment.
  • FIG. 8 is a first plan view showing the configuration of the antenna module according to the second embodiment.
  • FIG. 9 is a second plan view showing the configuration of the antenna module according to the second embodiment.
  • FIG. 10 is a plan view showing the configuration of the three distributors according to the second embodiment.
  • FIG. 11 is a graph showing the directivity of the array antenna according to the second embodiment.
  • FIG. 12 is a graph showing the directivity when the state of the phase shifter of the array antenna according to the second embodiment is changed.
  • FIG. 13 is a perspective view showing the configuration of an audio device including the antenna module according to the second embodiment.
  • FIG. 14 is a plan view showing the configuration of the multi-band antenna according to the third embodiment.
  • FIG. 15 is a graph showing an example of the first simulation result of the directivity of the multi-band antenna according to the third embodiment.
  • FIG. 16 is a graph showing an example of the second simulation result of the directivity of the multi-band antenna according to the third embodiment.
  • FIG. 17 is a graph showing the relationship between the width of the ground contact portion and the minimum inductance value of each high inductance element of the second high inductance portion according to the third embodiment.
  • each figure is a schematic view and is not necessarily exactly illustrated. Further, in each figure, the same components are designated by the same reference numerals.
  • FIG. 1 is a plan view showing the configuration of the multi-band antenna 1 according to the present embodiment.
  • FIG. 1 shows a plan view of the substrate 40 of the multi-band antenna 1 in a plan view.
  • the direction perpendicular to the main surface 41 of the substrate 40 of the multi-band antenna 1 is the Z-axis direction
  • the two directions perpendicular to the Z-axis direction and perpendicular to each other are the X-axis direction and the Y-axis direction. It is said.
  • the multi-band antenna 1 is an antenna that transmits and receives signals in a plurality of frequency bands.
  • the multi-band antenna 1 transmits and receives a signal in the first frequency band including the first frequency and a signal in the second frequency band including the second frequency lower than the first frequency.
  • the first frequency band and the second frequency band are not particularly limited, but in the present embodiment, the 5 GHz band and the 2.4 GHz band are used as the first frequency band and the second frequency band, respectively.
  • the multi-band antenna 1 can be used as a dual-band antenna in the 5 GHz band and the 2.4 GHz band based on the wireless LAN standard.
  • the multi-band antenna 1 includes a substrate 40, an input terminal 16, an antenna portion 10, and a grounding portion 20.
  • the multi-band antenna 1 further includes a ground terminal 26.
  • the substrate 40 is a member that serves as a base for the multi-band antenna 1.
  • the substrate 40 is a circuit board, and the antenna portion 10 and the grounding portion 20 are arranged on one main surface 41 of the substrate 40.
  • the substrate 40 is a rectangular plate-shaped dielectric.
  • the substrate 40 is, for example, a glass epoxy substrate.
  • the input terminal 16 is a terminal arranged on the board 40 to input a signal.
  • the high frequency signal transmitted by the multi-band antenna 1 is input to the input terminal 16.
  • the input terminal 16 also functions as an output terminal that outputs a high-frequency signal received by the multi-band antenna 1.
  • a signal is input to the input terminal 16 from, for example, a main surface on the back side of the main surface 41 of the substrate 40 via a via wiring penetrating the substrate 40. Further, the input terminal 16 is connected to the antenna unit 10.
  • the ground terminal 26 is a terminal arranged on the board 40 and connected to the ground.
  • the ground terminal 26 is arranged on the main surface 41 of the substrate 40 and is connected to the ground portion 20.
  • the ground terminal 26 is connected to the ground via, for example, a via wiring penetrating the substrate 40.
  • the number of ground terminals 26 is not particularly limited, but is two in the present embodiment.
  • the antenna portion 10 is a conductive member arranged on the substrate 40 and connected to the input terminal 16.
  • the signal in the first frequency band and the signal in the second frequency band resonate in the antenna unit 10.
  • radio waves are radiated from the antenna unit 10.
  • the antenna portion 10 has a first low inductance portion 11, a first high inductance portion 12, and a first tip portion 13 connected in series from the input terminal 16 side.
  • the sum of the electrical lengths of the first low inductance portion 11, the first high inductance portion 12, and the first tip portion 13 is 1/4 wavelength of the second frequency.
  • the signal in the second frequency band including the second frequency resonates in the antenna unit 10.
  • the position where the antenna portion 10 is connected to the input terminal 16 is not particularly limited, but in the present embodiment, the input terminal 16 is arranged at the end of the first low inductance portion 11 on the grounding portion 20 side. More specifically, the input terminal 16 is arranged only at the end portion of the first low inductance portion 11 on the grounding portion 20 side, and is not arranged at the first high inductance portion 12 and the first tip portion 13.
  • the end of the first low inductance portion 11 is, for example, a range of 10% or less of the length of the first low inductance portion 11 in the Y-axis direction from the end of the first low inductance portion 11 on the grounding portion 20 side. Means the area of.
  • the antenna portion 10 is a conductive member patterned on the main surface 41 of the substrate 40, and is formed of, for example, a metal film such as a copper film. Further, the first low inductance portion 11, the first high inductance portion 12, and the first tip portion 13 are arranged in the Y-axis direction of FIG. As a result, the Y-axis direction in FIG. 1 becomes the longitudinal direction of the antenna portion 10 and the resonance direction of the signal in the antenna portion 10. As shown in FIG. 1, the widths of the first low inductance portion 11, the first high inductance portion 12, and the first tip portion 13 (that is, the direction perpendicular to the resonance direction and parallel to the main surface 41 of the substrate 40). Dimensions) are the same.
  • the first low inductance portion 11 is a portion of the antenna portion 10 connected to the input terminal 16.
  • the input terminal 16 is connected to one end of the first low inductance portion 11, and the first high inductance portion 12 is connected to the other end.
  • the electrical length of the first low inductance portion 11 is 1/4 wavelength of the first frequency.
  • the first low inductance section 11 has a lower inductance than the first high inductance section 12.
  • the first low inductance portion 11 has a meander shape, but does not function as a choke coil for signals in the first frequency band and the second frequency band. It has a low inductance (that is, it does not block the signal).
  • the dimension of the first low inductance portion 11 in the resonance direction that is, the Y-axis direction in FIG. 1 can be reduced.
  • the first high inductance portion 12 is a portion of the antenna portion 10 that is arranged between the first low inductance portion 11 and the first tip portion 13, and has a meander shape.
  • the first high inductance section 12 has a higher inductance than the first low inductance section 11.
  • the meander shape of the first high inductance portion 12 has a smaller line width and spacing than the meander shape of the first low inductance portion 11. As a result, the inductance of the first high inductance section 12 becomes higher than that of the first low inductance section 11.
  • the first high inductance portion 12 has a line width of 0.1 mm, an interval of 0.1 mm, a length (dimension in the Y-axis direction in FIG.
  • the first high inductance unit 12 functions as a choke coil for signals in the first frequency band. That is, the effective electric length of the antenna unit 10 with respect to the signal of the first frequency band input from the input terminal 16 connected to the first low inductance unit 11 is the electric length of the first low inductance unit 11 (first frequency). 1/4 wavelength). Therefore, in the antenna unit 10, the signal in the first frequency band resonates.
  • the first high inductance unit 12 has a low inductance that does not function as a choke coil with respect to a signal in the second frequency band. Therefore, the first high inductance unit 12 does not block the signal in the second frequency band. Therefore, the signal in the second frequency band resonates in the path including the first low inductance portion 11, the first high inductance portion 12, and the first tip portion 13 of the antenna portion 10.
  • the first tip portion 13 is a portion of the antenna portion 10 arranged at the end portion farthest from the input terminal 16 in the resonance direction.
  • the shape of the first tip portion 13 is not particularly limited, but is rectangular in the present embodiment. As a result, for example, the current density at the first tip portion 13 can be increased as compared with the case where the first tip portion 13 has a meander shape, so that the radiation efficiency of radio waves from the first tip portion 13 can be increased.
  • the grounding portion 20 is a conductive member arranged on the substrate 40 and insulated from the input terminal 16.
  • the grounding portion 20 is arranged at a distance of a predetermined distance from the antenna portion 10 in the resonance direction.
  • the distance between the antenna portion 10 and the grounding portion 20 is, for example, greater than 0 and less than or equal to about 1 mm. In the present embodiment, the distance between the antenna portion 10 and the grounding portion 20 is 0.5 mm.
  • the width of the grounding portion 20 (that is, the dimension in the direction perpendicular to the resonance direction and parallel to the main surface 41 of the substrate 40) is wider than the width of the antenna portion 10.
  • the grounding portion 20 has a second low inductance portion 21, a second high inductance portion 22, and a second tip portion 23 connected in series from the input terminal 16 side.
  • the grounding portion 20 is a conductive member patterned on the main surface 41 of the substrate 40, and is formed of, for example, a metal film such as a copper film.
  • the second low inductance portion 21, the second high inductance portion 22, and the second tip portion 23 are arranged in the Y-axis direction of FIG.
  • the total electric length of the second low inductance portion 21, the second high inductance portion 22, and the second tip portion 23 is such that the directivity of the second frequency radio wave radiated from the antenna portion 10 is the longitudinal direction of the antenna portion 10 ( That is, it is set to spread along a plane perpendicular to the Y-axis direction of FIG. 1 (that is, a plane parallel to the ZX plane of FIG. 1).
  • the relationship between the total electric length and the directivity of the radio wave of the second frequency can be obtained by, for example, simulation.
  • the grounding portion 20 is connected to the grounding terminal 26.
  • the arrangement of the ground terminal 26 is not particularly limited, but in the present embodiment, the ground terminal 26 is arranged at the end of the second low inductance portion 21 on the antenna portion 10 side (that is, the input terminal 16 side). More specifically, the two ground terminals 26 are arranged only at the end of the second low inductance portion 21 on the antenna portion 10 side, and are not arranged at the second high inductance portion 22 and the second tip portion 23.
  • the end of the second low inductance portion 21 is, for example, the length of the second low inductance portion 21 in the resonance direction (Y-axis direction in FIG. 1) from the end of the second low inductance portion 21 on the antenna portion 10 side. It means an area in the range of 10% or less of the inductance.
  • the second low inductance portion 21 is a portion of the grounding portion 20 that is arranged at the position closest to the antenna portion 10.
  • the ground terminal 26 is connected to one end of the second low inductance portion 21, and the second high inductance portion 22 is connected to the other end.
  • the electrical length of the second low inductance section 21 is set so that the directivity of the first frequency radio wave radiated from the antenna section 10 spreads along a plane perpendicular to the longitudinal direction of the antenna section 10.
  • the relationship between the electric length of the second low inductance portion 21 and the directivity of the radio wave of the first frequency can be obtained by, for example, simulation.
  • the second low inductance section 21 has a lower inductance than the second high inductance section 22.
  • the second low inductance portion 21 has a rectangular shape, but the shape of the second low inductance portion 21 is not limited to this.
  • the shape of the second low inductance portion 21 is designed so that the inductance of the second low inductance portion 21 has such a low inductance that it does not function as a choke coil with respect to the signals of the first frequency and the second frequency. Good.
  • the second high inductance portion 22 is a portion of the grounding portion 20 that is arranged between the second low inductance portion 21 and the second tip portion 23, and has a meander shape.
  • the second high inductance section 22 has a higher inductance than the second low inductance section 21.
  • the second high inductance unit 22 functions as a choke coil for signals in the first frequency band. That is, the effective electrical length of the grounding portion 20 with respect to the signal in the first frequency band induced in the second low inductance portion 21 is the electrical length of the second low inductance portion 21. Further, the second high inductance unit 22 has a low inductance that does not function as a choke coil with respect to a signal in the second frequency band.
  • the second high inductance unit 22 does not block the signal in the second frequency band. Therefore, the effective electrical length of the grounding portion 20 with respect to the signal in the second frequency band includes the electrical length of the path including the second high inductance portion 22 of the grounding portion 20.
  • the second high inductance section 22 has two high inductance elements 22a and 22b connected to both ends of the second low inductance section 21 in the width direction (X-axis direction in FIG. 1), respectively.
  • An opening 22c is formed between the two high inductance elements 22a and 22b. That is, a region in which the conductive member is not arranged is formed between the two high inductance elements 22a and 22b. The region corresponding to the opening 22c of the substrate 40 may not be provided with an opening.
  • Each of the two high inductance elements 22a and 22b has a meander shape. Further, the two high inductance elements 22a and 22b have a structure that is horizontally inverted from each other.
  • the electrical lengths of the two high inductance elements 22a and 22b are equal.
  • the electric length of the second high inductance portion 22 of the multi-band antenna 1 is defined as the electric length of one of the two high inductance elements 22a and 22b.
  • the line width and pitch of the two high inductance elements 22a and 22b in the meander-shaped portion may be the same as the line width and pitch of the first high-inductance portion 12 of the antenna portion 10 in the meander-shaped portion, respectively. This makes it possible to facilitate the design of the multi-band antenna 1.
  • the current indicated by the broken line arrow in FIG. 1 is either the high inductance element 22a or the high inductance element 22b. Pass through.
  • the second tip portion 23 is a portion of the grounding portion 20 arranged at the end portion farthest from the antenna portion 10 in the resonance direction.
  • the shape of the second tip portion 23 is not particularly limited, but in the present embodiment, the second tip portion 23 has a rectangular shape.
  • the second tip portion 23 connects the two high inductance elements 22a and 22b of the second high inductance portion 22. As a result, in the second tip portion 23, the current components flowing from the two high inductance elements 22a and 22b into the second tip portion 23 can be canceled out, so that the radiation of radio waves spreading in the resonance direction due to these current components can be suppressed. ..
  • FIG. 2 is a plan view showing the configuration of the multi-band antenna 1001 according to the comparative example.
  • FIG. 2 shows a plan view of the substrate 40 of the multi-band antenna 1001 according to the comparative example in a plan view.
  • 3 and 4 are diagrams showing an outline of the directivity of the multi-band antenna according to the present embodiment and the comparative example at the first frequency, respectively.
  • the multi-band antenna 1001 according to the comparative example shown in FIG. 2 has a substrate 40, an input terminal 16, a ground terminal 26, an antenna portion 10, and a ground portion, similarly to the multi-band antenna 1 according to the present embodiment. It is equipped with 1020.
  • the multi-band antenna 1001 according to the comparative example is different from the multi-band antenna 1 according to the present embodiment in the configuration of the grounding portion 1020, and is consistent in other respects.
  • the grounding portion 1020 according to the comparative example has an electric length equivalent to the electric length of the entire grounding portion 20 according to the present embodiment.
  • the ground contact portion 1020 according to the comparative example has a flat plate shape. In other words, the grounding portion 1020 according to the comparative example has the same configuration as the second low inductance portion 21 of the grounding portion 20 according to the present embodiment as a whole.
  • the directivity of the radio wave of the second frequency radiated from the antenna portion 10 is along the plane perpendicular to the longitudinal direction of the antenna portion 10.
  • the electric length of the entire ground contact portion 20 is set so as to spread. Since the grounding portion 1020 according to the comparative example also has an electric length equivalent to that of the grounding portion 20 according to the present embodiment, the multi-band antenna 1001 according to the comparative example also has a second frequency radio wave radiated from the antenna portion 10. The directivity extends along a plane perpendicular to the longitudinal direction of the antenna portion 10.
  • the multi-band antenna 1 includes the second high inductance section 22 which functions as a choke coil with respect to the signal of the first frequency, so that the second low inductance section 21
  • the effective electrical length of the grounding section 20 is equal to the electrical length of the second low inductance section 21.
  • the electrical length of the second low inductance section 21 is set so that the directivity of the first frequency radio wave radiated from the antenna section 10 spreads along a plane perpendicular to the longitudinal direction of the antenna section 10. .. Therefore, as shown in FIG. 3, the directivity of the radio wave of the first frequency spreads along the plane perpendicular to the longitudinal direction of the antenna portion 10.
  • the electric length for the signal of the first frequency is the same as the electric length for the second frequency, and the entire grounding portion 1020. Is equal to the electrical length of.
  • the directivity of the radio wave of the first frequency is closer to the grounding portion 20 with respect to the plane perpendicular to the longitudinal direction of the antenna portion 10. It spreads diagonally (that is, diagonally downward in FIG. 4). Although only the directivity in the plane parallel to the XY plane is shown in FIG.
  • the multi-band antenna 1001 passes through the input terminal 16 of the multi-band antenna 1001 and is parallel to the Y axis in all the planes.
  • the directivity of is the same as that of FIG. This is because, in the multi-band antenna 1001 according to the comparative example, the effective electric length of the grounding portion 1020 with respect to the signal of the first frequency is longer than that of the multi-band antenna 1 according to the present embodiment, so that the grounding portion 1020 It is considered that this is because the electric field component generated by the current flowing into the tip portion becomes stronger than the electric field component generated by the antenna portion 10.
  • the grounding portion 20 has the second high inductance portion 22 having a meander shape, so that the effective electricity of the grounding portion 20 with respect to the first frequency is obtained.
  • the length can be shorter than the effective electrical length for the second frequency signal. Therefore, by appropriately setting the effective electric length of the grounding portion 20 for each signal of the first frequency and the second frequency, it is possible to realize the directivity perpendicular to the resonance direction in the frequency band including each frequency. ..
  • Such a multi-band antenna 1 is particularly effective when used in an array antenna, for example. That is, since the multi-band antenna 1 has a directivity perpendicular to the resonance direction, each multi-band antenna radiates when a plurality of multi-band antennas 1 are arranged in a direction perpendicular to the resonance direction to form an array antenna. It is possible to enhance the interaction between the radio waves.
  • 5 and 6 are graphs showing an example of a simulation result of directivity of the multi-band antenna 1 according to the present embodiment.
  • 5 and 6 show simulation results when the inductance of each high inductance element of the second high inductance portion 22 is 6 nH and 7 nH, respectively.
  • the width Wg of the ground contact portion 20 (that is, the dimension in the direction perpendicular to the resonance direction and parallel to the main surface 41 of the substrate 40) is set to 7 mm.
  • the directivity in each case where the frequency of the signal of the first frequency band input to the input terminal 16 is 5.0 GHz, 5.2 GHz, 5.4 GHz, 5.6 GHz, 5.8 GHz, and 6.0 GHz.
  • the sex is shown.
  • the angle ⁇ yx in each figure indicates an angle of inclination from the Y-axis direction to the X-axis direction in each figure.
  • FIG. 7 is a graph showing the relationship between the width Wg of the grounding portion 20 and the minimum inductance value Lmin of each high inductance element of the second high inductance portion 22 according to the present embodiment.
  • the minimum inductance value Lmin means the inductance value of each high inductance element required to realize directivity substantially perpendicular to the resonance direction with respect to the signal in the first frequency band. In the graph shown in FIG. 7, the minimum inductance value Lmin when the first frequency band is the 5 GHz band is shown.
  • the minimum inductance values Lmin of each high inductance element are 5 nH, 4 nH and 2.5 nH, respectively. From this, it can be seen that when the width Wg of the grounding portion 20 is 7 mm or more, the minimum inductance value Lmin of each high inductance element is 7 nH or more.
  • the antenna module according to the second embodiment will be described.
  • the antenna module according to the present embodiment is an application example of the multi-band antenna 1 according to the first embodiment.
  • 8 and 9 are first and second plan views showing the configuration of the antenna module 100 according to the present embodiment, respectively.
  • FIG. 8 a plan view of one main surface 141 of the substrate 140 of the antenna module 100 in a plan view is shown.
  • FIG. 9 a plan view of each component arranged on the main surface on the back side of the main surface 141 on the substrate 140 is shown, and the outline of the substrate 140 is also shown by a dotted line.
  • the antenna module 100 is a module including an array antenna 101 and a distributor that distributes signals to each multi-band antenna constituting the array antenna 101.
  • the antenna module 100 is a module that performs wireless communication based on the wireless LAN standard, and transmits / receives signals in the 5 GHz band and the 2.4 GHz band as the first frequency band and the second frequency band, respectively.
  • the antenna module 100 includes a 3 distributor 106 as a distributor.
  • the antenna module 100 includes a ground electrode 190, lines 61, 62, 63, 71, 72 and 73, a phase shifter 80, and ground wiring 71 g, 72 g and 73 g. It further includes a connector Cn and a control terminal Ts.
  • the array antenna 101 is an antenna having a plurality of multi-band antennas.
  • the array antenna 101 has three multi-band antennas 1a, 1b and 1c.
  • the three multi-band antennas 1a, 1b and 1c share a substrate 140.
  • other components of the antenna module 100 are also arranged on the substrate 140.
  • the configurations of the three multi-band antennas 1a, 1b, and 1c other than the substrate 140 are the same as those of the multi-band antenna 1 according to the first embodiment.
  • the three multi-band antennas 1a, 1b and 1c are arranged in a direction (that is, an X-axis direction) perpendicular to their respective resonance directions (that is, the Y-axis direction).
  • the multi-band antennas 1a, 1b and 1c have directivity perpendicular to the resonance direction as described in the first embodiment, the multi-band antennas 1a, 1b and 1c are arranged in a direction perpendicular to the resonance direction and arranged in an array.
  • the antenna is configured, the interaction between the radio waves radiated by each multi-band antenna can be enhanced.
  • the substrate 140 has the same configuration as the substrate 40 according to the first embodiment.
  • the antenna portion 10 and the ground portion 20 of each multi-band antenna are arranged on one main surface 141 of the substrate 140.
  • the ground electrode 190 is an electrode connected to the ground.
  • the ground electrode 190 is arranged on the main surface 141 of the substrate 140. In the present embodiment, the ground electrode 190 is arranged at a position adjacent to the ground portion 20 of each multi-band antenna of the array antenna 101.
  • the ground electrode 190 also functions as a shield wiring for each line arranged on the main surface on the back side of the main surface 141 of the substrate 140.
  • the ground electrode 190 is, for example, a conductive member patterned on the main surface 141 of the substrate 140, and is formed of, for example, a metal film such as a copper film.
  • the ground electrode 190 is connected to each of the conductive members arranged on the main surface on the back side of the main surface 141 of the substrate 140 via the via wiring penetrating the substrate 140 at the terminals 196a to 196c, 197, 198 and 199. ..
  • the 3-distributor 106 is a distributor that distributes signals in the first frequency band and the second frequency band into three.
  • the three distributor 106 according to the present embodiment will be described with reference to FIG.
  • FIG. 10 is a plan view showing the configuration of the three distributor 106 according to the present embodiment. In FIG. 10, the inside of the broken line frame shown in FIG. 9 is enlarged and shown.
  • the 3 distributor 106 includes an input terminal T0, a first output terminal T1, a second output terminal T2, a third output terminal T3, a first transmission line L1, and a second transmission. It includes a line L2, a third transmission line L3, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4.
  • Input terminal T0 is a terminal to which a signal is input.
  • signals in the first frequency band including the first frequency and the second frequency band including the second frequency lower than the first frequency are input to the input terminal T0.
  • the first output terminal T1, the second output terminal T2, and the third output terminal T3 are terminals that output three distributed signals in which the signal input from the input terminal T0 is divided into three, respectively.
  • the three distributed signals having the same phase are output from the first output terminal T1, the second output terminal T2, and the third output terminal T3, respectively.
  • the first transmission line L1, the second transmission line L2, and the third transmission line L3 are lines connecting the input terminal T0 and the first output terminal T1, the second output terminal T2, and the third output terminal T3, respectively. ..
  • the first transmission line L1 includes a first input side line L11 and a first output side line L12 connected in series at the first connection point CP1 in order from the input terminal T0 side.
  • the second transmission line L2 includes a second input side line L21 and a second output side line L22 connected in series at the second connection point CP2 in order from the input terminal T0 side.
  • the third transmission line L3 includes a third input side line L31 and a third output side line L32 connected in series at the third connection point CP3 in order from the input terminal T0 side.
  • the width of the second input side line L21 is narrower than the width of the first input side line L11 and the third input side line L31. In this way, by narrowing the width of the second input side line L21, the second input side line L21 is curved to secure the electric length, and the first input side line L11 and the third input side line L31 It becomes easy to fit the second input side line L21 in the sandwiched area.
  • the width of the second output side line L22 is narrower than the width of the first output side line L12 and the third output side line L32. In this way, by narrowing the width of the second output side line L22, the second output side line L22 is curved to secure the electric length, and the first output side line L12 and the third output side line L32 It becomes easy to fit the second output side line L22 in the sandwiched region.
  • the electrical length of each of the first input side line L11, the second input side line L21, and the third input side line L31 is 1/4 wavelength of the first frequency.
  • the electrical length of each of the first transmission line L1, the second transmission line L2, and the third transmission line L3 is 1/4 wavelength of the second frequency lower than the first frequency.
  • the terminal T3 and the second output terminal T2 are connected via a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, respectively.
  • the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are absorption resistors.
  • the resistance values of the 3rd resistor R3 and the 4th resistor R4 are 100 ⁇ , which is twice the impedance on the output side, and the 1st resistor R1 and the 2nd resistor are
  • the resistance value of the resistor R2 is twice or more and four times or less the impedance on the output side, that is, 100 ⁇ or more and 200 ⁇ or less.
  • the resistance values of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are the same, and all of them are 100 ⁇ .
  • the three distributor 106 according to the present embodiment has the effect of being smaller than a general Wilkinson type distributor by having the above configuration.
  • the electrical lengths of the lines corresponding to the first output side line L12, the second output side line L22, and the third output side line L32 of the three distributor 106 according to the present embodiment are set to the second. It needs to be 1/4 wavelength of 2 frequencies.
  • an absorption resistor is provided between the first connection point CP1 and the second connection point CP2 and between the third connection point CP3 and the second connection point CP2.
  • the electrical length of the first transmission line L1, the second transmission line L2, and the third transmission line L3 can be set to 1/4 wavelength of the second frequency. Therefore, in the three-distributor 106 according to the present embodiment, the electrical lengths of the first transmission line L1, the second transmission line L2, and the third transmission line L3 are distributed by the Wilkinson type by only 1/4 wavelength of the first frequency. It can be made smaller than a vessel. As a result, the antenna module 100 can be miniaturized.
  • the connector Cn is a connecting member for inputting a signal to the antenna module 100 from the outside.
  • the configuration of the connector Cn is not particularly limited, but in the present embodiment, it is a coaxial connector.
  • the signal wiring of the connector Cn is connected to the input terminal T0 of the 3 distributor 106. As a result, a signal can be input to the 3 distributor 106 from the outside via the connector Cn.
  • the connector Cn has a connector ground Cg connected to the ground.
  • the shield wiring of the connector Cn is connected to the connector ground Cg.
  • the connector ground Cg is connected to the terminal 198 of the ground electrode 190 via the via wiring penetrating the substrate 140.
  • the line 61 is a conductive member that connects the line 71 and the first output terminal T1 of the 3 distributor 106.
  • the electric length of the line 61 is set based on the phase difference given between the distributed signals distributed to the lines 71 to 73 and the electric lengths of the lines 62 and 63.
  • a phase shifter 80 is connected to the line 61, and the amount of phase delay in the line 61 changes according to the state of the phase shifter 80.
  • the line 62 is a conductive member that connects the line 72 and the second output terminal T2 of the 3 distributor 106.
  • the electric length of the line 62 is set based on the phase difference given between the distributed signals distributed to the lines 71 to 73 and the electric length of the lines 61 and 63.
  • the line 63 is a conductive member that connects the line 73 and the third output terminal T3 of the 3 distributor 106.
  • the electric length of the line 63 is set based on the phase difference given between the distributed signals distributed to the lines 71 to 73 and the electric lengths of the lines 61 and 62.
  • the phase shifter 80 is a device connected to the line 61 and changing the amount of phase delay of the distributed signal on the line 61.
  • the phase shifter 80 is a loaded line type phase shifter.
  • the phase shifter 80 has lines 81 and 82, capacitors 83 and 84, PIN diodes 86 and 87, and a ground electrode 85.
  • the line 81 is a line coupled to the line 61 via a capacitor 83. One end of the line 81 is connected to the capacitor 83 and the other end is connected to the PIN diode 86.
  • the line 82 is a line coupled to the line 61 via a capacitor 84.
  • the line 82 is coupled to the line 61 at a position different from the position where the line 81 is connected.
  • One end of the line 82 is connected to the capacitor 84 and the other end is connected to the PIN diode 87.
  • the capacitors 83 and 84 are elements for connecting the line 61 and the lines 81 and 82, respectively.
  • the phase shifter 80 and the line 61 are coupled by capacitors 83 and 84.
  • the ground electrode 85 is an electrode connected to the ground.
  • the ground electrode 190 is connected to the terminal 197 via a via wiring penetrating the substrate 140.
  • the PIN diodes 86 and 87 are switches that switch the connection state between the lines 81 and 82 and the ground electrode 85, respectively, between the open state and the closed state.
  • the PIN diodes 86 and 87 are controlled by a control signal input to the control terminals Ts.
  • the phase delay amount of the distributed signal on the line 61 can be switched by setting the states of the PIN diodes 86 and 87 in the open state or the closed state together.
  • the control terminal Ts is a terminal to which a control signal for controlling the states of the PIN diodes 86 and 87 of the phase shifter 80 is input.
  • the control terminal Ts has a ground terminal, and the ground terminal is connected to the terminal 191 on the substrate 140 and the terminal 199 of the ground electrode 190 via the via wiring penetrating the substrate 140.
  • Each of the lines 71, 72, and 73 is a long conductive member to which the distribution signal distributed by the three distributor 106 is input, and is in the Y-axis direction of FIG. 9 (that is, the resonance direction of each multi-band antenna). ).
  • one end of the line 71 is connected to the line 61.
  • a terminal 74 is arranged at the other end of the line 71.
  • the terminal 74 is connected to the input terminal 16 of the multi-band antenna 1a via a via wiring penetrating the substrate 140.
  • the line 71 receives the distribution signal from the first output terminal T1 of the 3 distributor 106 via the line 61, and outputs the distribution signal to the multi-band antenna 1a.
  • One end of the line 72 is connected to the line 62.
  • a terminal 76 is arranged at the other end of the line 72.
  • the terminal 76 is connected to the input terminal 16 of the multi-band antenna 1b via a via wiring penetrating the substrate 140.
  • the line 72 receives the distribution signal from the second output terminal T2 of the 3 distributor 106 via the line 62, and outputs the distribution signal to the multi-band antenna 1b.
  • One end of the line 73 is connected to the line 63.
  • a terminal 78 is arranged at the other end of the line 73.
  • the terminal 78 is connected to the input terminal 16 of the multi-band antenna 1c via a via wiring penetrating the substrate 140.
  • the line 73 receives the distribution signal from the third output terminal T3 of the 3 distributor 106 via the line 63, and outputs the distribution signal to the multi-band antenna 1c.
  • Each of the two ground wires 71g is a long conductive member connected to the ground and arranged along the line 71, and extends in the Y-axis direction of FIG.
  • the two ground wires 71 g are arranged in the X-axis direction of FIG. 9, and the line 71 is arranged between the two ground wires 71 g.
  • the two ground wires 71g and the line 71 are arranged apart from each other.
  • a terminal 75g is arranged at one end of each of the two ground wires 71g, and a terminal 74g is arranged at the other end.
  • the terminal 75g is connected to the terminal 196a of the ground electrode 190 via a via wiring penetrating the substrate 140.
  • the terminal 74g is connected to the ground terminal 26 of the ground portion 20 of the multi-band antenna 1a via a via wiring penetrating the substrate 140.
  • Each of the two grounding wires 72g is a long conductive member connected to the ground and arranged along the line 72, and extends in the Y-axis direction of FIG.
  • the two ground wires 72 g are arranged in the X-axis direction of FIG. 9, and the line 72 is arranged between the two ground wires 72 g.
  • the two ground wires 72 g and the line 72 are arranged apart from each other.
  • a terminal 77g is arranged at one end of each of the two ground wires 72g, and a terminal 76g is arranged at the other end.
  • the terminal 77g is connected to the terminal 196b of the ground electrode 190 via the via wiring penetrating the substrate 140.
  • the terminal 76g is connected to the ground terminal 26 of the ground portion 20 of the multi-band antenna 1b via a via wiring penetrating the substrate 140.
  • Each of the two ground wires 73g is a long conductive member connected to the ground and arranged along the line 73, and extends in the Y-axis direction of FIG.
  • the two ground wires 73g are arranged in the X-axis direction of FIG. 9, and the line 73 is arranged between the two ground wires 73g.
  • the two ground wires 73g and the line 73 are arranged apart from each other.
  • a terminal 79g is arranged at one end of each of the two ground wires 73g, and a terminal 78g is arranged at the other end.
  • the terminal 79g is connected to the terminal 196c of the ground electrode 190 via the via wiring penetrating the substrate 140.
  • the terminal 78g is connected to the ground terminal 26 of the ground portion 20 of the multi-band antenna 1c via a via wiring penetrating the substrate 140.
  • the transmission lines, lines 61, 62, 63, 71 to 73, 81 and 82 of the three distributor 106 according to the present embodiment, and the ground wirings 71g, 72g and 73g are, for example, the main surface 141 of the substrate 140. It is a conductive member patterned on the main surface on the back side, and is formed of, for example, a metal film such as a copper film.
  • the lines 71, 72 and 73 form a coplanar line together with the ground wires 71 g, 72 g and 73 g, respectively.
  • the transmission lines of the three distributor 106 and the lines 61, 62 and 63 of the phase shifter 80 and the lines 81 and 82 of the phase shifter 80 according to the present embodiment are arranged at positions facing the ground electrode 190 via the substrate 140. Has been done. As a result, each line and the ground electrode 190 form a microstrip line.
  • the line 71 and the ground wiring 71g shown in FIG. 9 are arranged at positions facing the ground portion 20 of the multi-band antenna 1a shown in FIG.
  • the width (dimension in the X-axis direction) of the grounding portion 20 is the portion of the two grounding wires 71g that is arranged along the line 71 (that is, in the example shown in FIG. 9, the terminal 75g of the grounding wiring 71g. It is larger than the distance between the outer edges in the X-axis direction (the portion excluding the periphery of). That is, the grounding portion 20 projects outward from the two grounding wires 71g in the X-axis direction.
  • the width of the grounding portion 20 is 7 mm, and the distance between the outer edges of the two grounding wires 71g arranged along the line 71 in the X-axis direction is 3 mm. ..
  • the distance between the outer edges of the two grounding wires 71g arranged along the line 71 in the X-axis direction is 3 mm. ..
  • the width of the grounding portion 20 of the multi-band antennas 1b and 1c is also the same as the width of the grounding portion 20 of the multi-band antenna 1a, which is the X of the portion of the two opposing grounding wires arranged along the lines 72 and 73. Greater than the distance between the outer edges in the axial direction.
  • the operation and effect of the antenna module 100 according to the present embodiment will be described.
  • the antenna module 100 according to the present embodiment by appropriately setting the electric lengths of the lines 61, 62, and 63, the signal input to each multi-band antenna constituting the array antenna 101 can be obtained.
  • the phase can be adjusted.
  • the directivity of the array antenna 101 can be adjusted. For example, when there is an antenna near the antenna module 100 that transmits / receives signals in a frequency band close to the frequency band handled by the antenna module 100, the array antenna in the direction from the array antenna 101 of the antenna module 100 toward the other antenna.
  • the directivity of 101 it is possible to reduce the interference of radio waves between the antenna module 100 and the other antenna.
  • FIG. 11 is a graph showing the directivity of the array antenna 101 according to the present embodiment. Note that FIG. 11 shows the directivity when both the PIN diodes 86 and 87 of the phase shifter 80 of the antenna module 100 are turned off.
  • the angle ⁇ zx in FIG. 11 indicates an angle that is inclined from the Z-axis direction to the X-axis direction in each figure.
  • the directivity in the positive direction in the X-axis direction is reduced. Therefore, when there is another antenna on the positive side of the array antenna 101 having such directivity in the X-axis direction, the interference between the array antenna 101 and the other antenna can be reduced.
  • the phase shifter 80 can switch the phase of the signal input to the multi-band antenna 1a.
  • the phase of the signal input to the multi-band antenna 1a is about 50 depending on whether the PIN diodes 86 and b87 are both OFF and both are ON. ° Can be changed.
  • the effect of the phase shifter 80 will be described with reference to FIG.
  • FIG. 12 is a graph showing the directivity when the state of the phase shifter 80 of the array antenna 101 according to the present embodiment is changed.
  • FIG. 12 shows the directivity when both the PIN diodes 86 and 87 of the phase shifter 80 are turned on.
  • the angle ⁇ zx in FIG. 12 indicates an angle inclined from the Z-axis direction to the X-axis direction in each figure.
  • the directivity of the array antenna 101 can be significantly changed by the phase shifter 80.
  • the effect of the phase shifter 80 is effective when the radio wave environment around the antenna module 100 changes. For example, when the arrangement of the antenna module 100 and other antennas is changed, the relative positions of the antenna module 100 and the other antennas may change.
  • the relative positions of the antenna module 100 and the other antennas do not change, when the antenna module 100 and the other antennas are moved, the relative positions of the surrounding structures and the antenna module 100 may change.
  • the interference of the reflected radio waves may become a problem in the array antenna 101 of the antenna module 100.
  • the radio wave environment changes in this way, interference with other radio waves can be suppressed by changing the directivity of the array antenna 101 using the phase shifter 80.
  • FIG. 13 is a perspective view showing the configuration of an audio device 103 including the antenna module 100 according to the present embodiment.
  • the audio device 103 shown in FIG. 13 mainly includes a housing 103c, antenna modules 100, 100a and 104, and speakers Sp0 to Sp4.
  • a housing 103c In FIG. 13, only the outline of the housing 103c is shown by a dotted line in order to show the arrangement of each component.
  • the antenna module 100a is a module that performs wireless communication based on the wireless LAN standard like the antenna module 100, and transmits / receives signals in the 5 GHz band and the 2.4 GHz band.
  • the antenna module 100a is a module similar to the antenna module 100, and the structure and arrangement of each component are reversed left and right with respect to the antenna module 100.
  • the directivity of the array antenna included in the antenna module 100a is the one in which the directivity of the array antenna 101 of the antenna module 100 is inverted left and right (that is, the graphs shown in FIGS. 11 and 12 are inverted left and right). ).
  • the antenna module 104 is a module that performs wireless communication with other devices. In the present embodiment, it is a module that transmits a 2.4 GHz band signal to another audio device based on a standard different from the wireless LAN standard.
  • other audio equipment is, for example, a subwoofer.
  • the sound device 103 since the sound device 103 includes three antenna modules 100, 100a and 104 that handle signals in the 2.4 GHz band, radio wave interference may occur between these modules.
  • the array antenna 101 of the antenna module 100 according to the present embodiment has low directivity on the positive side in the X-axis direction as shown in FIG. 11, it is possible to reduce radio wave interference with other modules.
  • the antenna module 100a has a structure in which the antenna module 100 is flipped horizontally, the array antenna of the antenna module 100a has low directivity on the negative side in the X-axis direction. Therefore, it is possible to reduce the interference of radio waves with other antenna modules arranged on the negative side in the X-axis direction of the antenna module 100a.
  • the radio wave radiated from the antenna module 104 may be reflected by the structure and reach the antenna modules 100 and 100a.
  • the directivity of each array antenna is changed by changing the setting of each phase shifter of the antenna modules 100 and 100a. By changing, the interference with the reflected radio wave can be reduced.
  • the multi-band antenna according to the third embodiment will be described.
  • the multi-band antenna according to the present embodiment is different from the multi-band antenna 1 according to the first embodiment in the resonating frequency band.
  • the multi-band antenna according to the present embodiment will be described focusing on the differences from the multi-band antenna 1 according to the first embodiment.
  • FIG. 14 is a plan view showing the configuration of the multi-band antenna 201 according to the present embodiment.
  • FIG. 14 shows a plan view of the substrate 240 of the multi-band antenna 201 in a plan view.
  • the direction perpendicular to the main surface 241 of the substrate 240 of the multi-band antenna 201 is the Z-axis direction
  • the two directions perpendicular to the Z-axis direction and perpendicular to each other are X.
  • the multi-band antenna 201 transmits and receives a signal in the first frequency band including the first frequency and a signal in the second frequency band including the second frequency lower than the first frequency.
  • the 2.4 GHz band and the 920 MHz band are used as the first frequency band and the second frequency band, respectively.
  • the multi-band antenna 201 includes a substrate 240, an input terminal 216, an antenna portion 210, and a ground portion 220.
  • the multi-band antenna 201 further includes a ground terminal 226.
  • the board 240 is a member that serves as a base for the multi-band antenna 201.
  • the board 240 is a circuit board, and an antenna portion 210 and a grounding portion 220 are arranged on one main surface 241 of the board 240.
  • the input terminal 216 is a terminal arranged on the board 240 to input a signal.
  • the high frequency signal transmitted by the multi-band antenna 201 is input to the input terminal 216.
  • the input terminal 216 also functions as an output terminal that outputs a high-frequency signal received by the multi-band antenna 201. Further, the input terminal 216 is connected to the antenna unit 210.
  • the ground terminal 226 is a terminal arranged on the board 240 and connected to the ground.
  • the ground terminal 226 is arranged on the main surface 241 of the substrate 240 and is connected to the ground portion 220.
  • the number of ground terminals 226 is not particularly limited, but is two in the present embodiment.
  • the antenna portion 210 is a conductive member arranged on the substrate 240 and connected to the input terminal 216.
  • the signal in the first frequency band and the signal in the second frequency band resonate in the antenna unit 210.
  • radio waves are radiated from the antenna unit 210.
  • the antenna portion 210 has a first low inductance portion 211, a first high inductance portion 212, and a first tip portion 213 connected in series from the input terminal 216 side.
  • the sum of the electrical lengths of the first low inductance portion 211, the first high inductance portion 212, and the first tip portion 213 is 1/4 wavelength of the second frequency.
  • the signal in the second frequency band including the second frequency resonates in the antenna unit 210.
  • the position where the antenna portion 210 is connected to the input terminal 216 is not particularly limited, but in the present embodiment, the input terminal 216 is arranged at the end of the first low inductance portion 211 on the grounding portion 220 side. More specifically, the input terminal 216 is arranged only at the end of the first low inductance portion 211 on the grounding portion 220 side, and is not arranged at the first high inductance portion 212 and the first tip portion 213.
  • the end of the first low inductance portion 211 is, for example, a range of 10% or less of the length of the first low inductance portion 211 in the Y-axis direction from the end of the first low inductance portion 211 on the grounding portion 20 side. Means the area of.
  • the first low inductance portion 211, the first high inductance portion 212, and the first tip portion 213 are arranged in the Y-axis direction of FIG.
  • the Y-axis direction in FIG. 14 becomes the longitudinal direction of the antenna portion 210 and the resonance direction of the signal in the antenna portion 210.
  • the widths of the first low inductance portion 211, the first high inductance portion 212, and the first tip portion 213 are the same.
  • the first low inductance portion 211 is a portion of the antenna portion 210 connected to the input terminal 216.
  • the input terminal 216 is connected to one end of the first low inductance portion 211, and the first high inductance portion 212 is connected to the other end.
  • the electrical length of the first low inductance portion 211 is 1/4 wavelength of the first frequency.
  • the first low inductance section 211 has a lower inductance than the first high inductance section 212.
  • the first low inductance portion 211 has a line width of 2.0 mm, an interval of 2.0 mm, and a length (Y-axis direction in FIG. 14). Dimension) 22 mm, width (dimension in the X-axis direction in FIG.
  • the first low inductance portion 211 has a meander shape, but has a low inductance such that it does not function as a choke coil (that is, does not block the signal) with respect to the signals in the first frequency band and the second frequency band. ..
  • the first low inductance portion 211 has portions that are not meander-shaped at both ends of the meander-shaped portion (that is, both ends in the Y-axis direction).
  • the total length of the two portions at both ends that are not in the shape of a meander is 7 mm. Therefore, the total length of the first low inductance portion 211 in the Y-axis direction is 29 mm.
  • the first high inductance portion 212 is a portion of the antenna portion 210 that is arranged between the first low inductance portion 211 and the first tip portion 213, and has a meander shape.
  • the first high inductance section 212 has a higher inductance than the first low inductance section 211.
  • the meander shape of the first high inductance portion 212 has a smaller line width and spacing than the meander shape of the first low inductance portion 211. As a result, the inductance of the first high inductance section 212 becomes higher than that of the first low inductance section 211.
  • the first high inductance portion 212 has a line width of 0.1 mm, an interval of 0.1 mm, a length (dimensions in the Y-axis direction in FIG. 14) of 7.1 mm, and a width (in the X-axis direction in FIG. 14). Dimensions) It has a meander shape of 7.5 mm.
  • the first high inductance portion 212 functions as a choke coil for signals in the first frequency band. That is, the effective electric length of the antenna unit 210 with respect to the signal of the first frequency band input from the input terminal 216 connected to the first low inductance unit 211 is the electric length of the first low inductance unit 211 (first frequency). 1/4 wavelength).
  • the signal in the first frequency band resonates.
  • the first high inductance portion 212 has a low inductance that does not function as a choke coil with respect to a signal in the second frequency band. Therefore, the first high inductance portion 212 does not block the signal in the second frequency band. Therefore, the signal in the second frequency band resonates in the path including the first low inductance portion 211, the first high inductance portion 212, and the first tip portion 213 of the antenna portion 210.
  • the first tip portion 213 is a portion of the antenna portion 210 arranged at the end farthest from the input terminal 216 in the resonance direction.
  • the shape of the first tip portion 213 is not particularly limited, but is rectangular in the present embodiment.
  • the grounding portion 220 is a conductive member arranged on the substrate 240 and insulated from the input terminal 216.
  • the grounding portion 220 is arranged at a distance from the antenna portion 210 by a predetermined distance in the resonance direction.
  • the distance between the antenna portion 210 and the grounding portion 220 is, for example, greater than 0 and less than or equal to about 3 mm. In the present embodiment, the distance between the antenna portion 210 and the grounding portion 220 is 2.0 mm.
  • the width of the grounding portion 220 (that is, the dimension in the direction perpendicular to the resonance direction and parallel to the main surface 241 of the substrate 240) is wider than the width of the antenna portion 210.
  • the grounding portion 220 has a second low inductance portion 221, a second high inductance portion 222, and a second tip portion 223 connected in series from the input terminal 216 side. Further, the second low inductance portion 221 and the second high inductance portion 222 and the second tip portion 223 are arranged in the Y-axis direction of FIG.
  • the total electrical lengths of the second low inductance section 221 and the second high inductance section 222 and the second tip section 223 are such that the directivity of the second frequency radio wave radiated from the antenna section 210 is the longitudinal direction of the antenna section 210. That is, it is set to spread along a plane perpendicular to the Y-axis direction of FIG. 14 (that is, a plane parallel to the ZX plane of FIG. 14).
  • the grounding portion 220 is connected to the grounding terminal 226.
  • the arrangement of the ground terminal 226 is not particularly limited, but in the present embodiment, the ground terminal 226 is arranged at the end of the second low inductance portion 221 on the antenna portion 210 side (that is, the input terminal 216 side). More specifically, the two ground terminals 226 are arranged only at the end of the second low inductance portion 221 on the antenna portion 210 side, and are not arranged at the second high inductance portion 222 and the second tip portion 223.
  • the end of the second low inductance portion 221 is, for example, the length of the second low inductance portion 221 in the resonance direction (Y-axis direction in FIG. 14) from the end of the second low inductance portion 221 on the antenna portion 210 side. It means an area in the range of 10% or less of the inductance.
  • the second low inductance portion 221 is a portion of the grounding portion 220 that is arranged at the position closest to the antenna portion 210.
  • the ground terminal 226 is connected to one end of the second low inductance portion 221 and the second high inductance portion 222 is connected to the other end.
  • the electrical length of the second low inductance section 221 is set so that the directivity of the first frequency radio wave radiated from the antenna section 10 spreads along a plane perpendicular to the longitudinal direction of the antenna section 210.
  • the second low inductance section 221 has a lower inductance than the second high inductance section 222.
  • the second low inductance portion 221 has a rectangular shape, but the shape of the second low inductance portion 221 is not limited to this.
  • the shape of the second low inductance portion 221 is designed so that the inductance of the second low inductance portion 221 has such a low inductance that it does not function as a choke coil with respect to the signals of the first frequency and the second frequency. Good.
  • the second high inductance portion 222 is a portion of the grounding portion 220 that is arranged between the second low inductance portion 221 and the second tip portion 223, and has a meander shape.
  • the second high inductance section 222 has a higher inductance than the second low inductance section 221.
  • the second high inductance section 222 functions as a choke coil for signals in the first frequency band. That is, the effective electrical length of the grounding portion 220 with respect to the signal in the first frequency band induced in the second low inductance portion 221 is the electrical length of the second low inductance portion 221. Further, the second high inductance portion 222 has a low inductance that does not function as a choke coil with respect to a signal in the second frequency band.
  • the second high inductance section 222 does not block the signal in the second frequency band. Therefore, the effective electrical length of the grounding portion 220 with respect to the signal in the second frequency band includes the electrical length of the path including the second high inductance portion 222 of the grounding portion 220.
  • the second high inductance portion 222 has two high inductance elements 222a and 222b connected to both ends of the second low inductance portion 221 in the width direction (X-axis direction in FIG. 14), respectively.
  • An opening 222c is formed between the two high inductance elements 222a and 222b. That is, a region in which the conductive member is not arranged is formed between the two high inductance elements 222a and 222b. An opening may not be provided in the region corresponding to the opening 222c of the substrate 240.
  • Each of the two high inductance elements 222a and 222b has a meander shape. Further, the two high inductance elements 222a and 222b have a structure that is horizontally inverted from each other.
  • the electrical lengths of the two high inductance elements 222a and 222b are equal.
  • the electric length of the second high inductance portion 222 of the multi-band antenna 201 is defined as the electric length of one of the two high inductance elements 222a and 222b.
  • the line width and pitch of the two high inductance elements 222a and 222b in the meander-shaped portion may be the same as the line width and pitch of the first high-inductance portion 212 of the antenna portion 210 in the meander-shaped portion, respectively.
  • a current corresponding to radio waves transmitted and received flows mainly along the edge edge. Therefore, by arranging the two high inductance elements 222a and 222b at the widthwise ends of the grounding portion 220, the current passes through either the high inductance element 222a and the high inductance element 222b.
  • the second tip portion 223 is a portion of the grounding portion 220 arranged at the end portion farthest from the antenna portion 210 in the resonance direction.
  • the second tip portion 223 has a rectangular shape. Further, the second tip portion 223 connects the two high inductance elements 222a and 222b of the second high inductance portion 222.
  • 15 and 16 are graphs showing an example of a simulation result of directivity of the multi-band antenna 201 according to the present embodiment.
  • 15 and 16 show simulation results when the inductance of each high inductance element of the second high inductance portion 222 is 37.5 nH and 45 nH, respectively.
  • the width Wg of the ground contact portion 220 (that is, the dimension in the direction perpendicular to the resonance direction and parallel to the main surface 41 of the substrate 40) is set to 20 mm.
  • the directivity in each case where the frequencies of the signals of the first frequency band and the second frequency band input to the input terminal 216 are 2.45 GHz and 920 MHz, respectively, is shown.
  • each high inductance element when the inductance of each high inductance element is less than 45 nH, directivity perpendicular to the resonance direction cannot be realized. It is considered that this is because the function of each high inductance element as a choke coil did not work sufficiently for a signal having a frequency of 2.45 GHz.
  • FIG. 17 is a graph showing the relationship between the width Wg of the grounding portion 220 and the minimum inductance value Lmin of each high inductance element of the second high inductance portion 222 according to the present embodiment.
  • the minimum inductance value Lmin means the inductance value of each high inductance element required to realize directivity substantially perpendicular to the resonance direction with respect to the signal in the first frequency band. In the graph shown in FIG. 17, the minimum inductance value Lmin when the first frequency band is the 2.45 GHz band is shown.
  • the minimum inductance value Lmin of each high inductance element is 55 nH, respectively. It was 50 nH, 45 nH, 45 nH, 45 nH and 35 nH. From this, it can be seen that when the width Wg of the grounding portion 220 is 15 mm or more, the minimum inductance value Lmin of each high inductance element is 55 nH or more.
  • the multi-band antenna 1 a dual band example of transmitting and receiving signals of two frequency bands has been shown, but the multi-band antenna of the present disclosure may transmit and receive three or more frequency bands.
  • a multi-band antenna that transmits and receives a third frequency band including a third frequency lower than the first frequency and higher than the second frequency in addition to the first frequency band and the second frequency band can be realized.
  • the first middle inductance section is inserted between the first low inductance section 11 and the first high inductance section 12, and the second low inductance section 21 and the second By inserting the second middle inductance section between the high inductance section 22 and the high inductance section 22, it is possible to realize a multi-band antenna capable of transmitting and receiving signals in three frequency bands from the first frequency band to the third frequency band.
  • the first middle inductance portion has a higher inductance than the first low inductance portion 11 and a lower inductance than the first high inductance portion 12.
  • the second middle inductance section has a higher inductance than the second low inductance section 21 and a lower inductance than the second high inductance section 22.
  • the first low inductance section 11 and the second low inductance section 21 do not function as choke coils for signals of the third frequency.
  • the first middle inductance portion and the second middle inductance portion function as choke coils for signals of the first frequency and do not function as choke coils for signals of the second frequency and the third frequency.
  • the first high inductance section 12 and the second high inductance section 22 function as choke coils for signals of the third frequency.
  • the total electric length of the first low inductance portion 11 and the first middle inductance portion is 1/4 wavelength of the third frequency.
  • the example in which the antenna module 100 is used in the audio device 103 is shown, but it can also be used in other devices.
  • the antenna module 100 may be used in a television receiver or the like.
  • the present disclosure also includes a form realized by arbitrarily combining the components and functions in each embodiment without departing from the purpose of the present disclosure.
  • the multi-band antenna of the present disclosure can be used as a part of an array antenna for an antenna module used in, for example, an audio device.

Abstract

L'invention concerne une antenne multibande (1) qui comprend : une carte (40) ; une borne d'entrée (16) servant à faire entrer des signaux ; une partie servant d'antenne conductrice (10) reliée à la borne d'entrée (16) et possédant, dans cet ordre depuis le côté de la borne d'entrée (16), une première partie à faible inductance (11), une première partie à inductance élevée (12) en forme de méandre, et une première partie avant (13), qui sont reliées en série ; et une partie servant de masse conductrice (20), isolée de la borne d'entrée (16) et possédant, dans cet ordre depuis la borne d'entrée (16), une deuxième partie à faible inductance (21), une deuxième partie à inductance élevée (22) en forme de méandre, et une deuxième partie avant (23), qui sont reliées en série, la longueur électrique de la première partie à faible inductance (11) étant un quart d'onde d'une première fréquence, et la somme des longueurs électriques de la première partie à faible inductance (11), de la première partie à inductance élevée (12) et de la première partie avant (13) étant un quart d'onde d'une deuxième fréquence.
PCT/JP2020/002036 2019-05-29 2020-01-22 Antenne multibande WO2020240916A1 (fr)

Applications Claiming Priority (2)

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JP2019100275 2019-05-29
JP2019-100275 2019-05-29

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WO2020240916A1 true WO2020240916A1 (fr) 2020-12-03

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001185938A (ja) * 1999-12-27 2001-07-06 Mitsubishi Electric Corp ２周波共用アンテナ、多周波共用アンテナ、および２周波または多周波共用アレーアンテナ
JP2006033068A (ja) * 2004-07-12 2006-02-02 Toshiba Corp アンテナおよび当該アンテナ搭載の携帯無線装置
WO2011080902A1 (fr) * 2009-12-28 2011-07-07 パナソニック株式会社 Dispositif d'antenne directive variable
US20140285387A1 (en) * 2013-03-24 2014-09-25 Delphi Deutschland Gmbh Broadband monopole antenna for vehicles for two frequency bands in the decimeter wavelength spectrum separated by a frequency gap
JP2015211425A (ja) * 2014-04-30 2015-11-24 大井電気株式会社 マルチバンドアンテナ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001185938A (ja) * 1999-12-27 2001-07-06 Mitsubishi Electric Corp ２周波共用アンテナ、多周波共用アンテナ、および２周波または多周波共用アレーアンテナ
JP2006033068A (ja) * 2004-07-12 2006-02-02 Toshiba Corp アンテナおよび当該アンテナ搭載の携帯無線装置
WO2011080902A1 (fr) * 2009-12-28 2011-07-07 パナソニック株式会社 Dispositif d'antenne directive variable
US20140285387A1 (en) * 2013-03-24 2014-09-25 Delphi Deutschland Gmbh Broadband monopole antenna for vehicles for two frequency bands in the decimeter wavelength spectrum separated by a frequency gap
JP2015211425A (ja) * 2014-04-30 2015-11-24 大井電気株式会社 マルチバンドアンテナ

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